Seven views on approximate convexity and the geometry of K-spaces

As in Hokusai's series of paintings "Thirty six views of mount Fuji" in which mount Fuji's is sometimes scarcely visible, the central topic of this paper is the geometry of $K$-spaces although in some of the seven views presented $K$-spaces are not easily visible. We study the interplay between the behaviour of approximately convex (and approximately affine) functions on the unit ball of a Banach space and the geometry of Banach K-spaces.Comment: 2 figure

Tetraparesia: an Unusual Presentation of Disseminated Tuberculosis

A 48-year-old man with a 4 months history of asthenia, anorexia, 10 kg weight loss and 1 month of hematuria and dysuria was admitted to another hospital for sudden muscular weakness. He was found to have areflexic tetraparesis and was referred to our hospital.On admission, he was bradycardic, tachypneic, with flaccid tetraplegia. Laboratory results showed metabolic acidemia, severe hyperkalemia and hyponatremia, acute renal dysfunction and sterile pyuria. After hyperkalemia correction, the neurological symptoms resolved.On the second day, he became febrile and chest radiograph and CT images showed a pulmonary bilateral reticulomicronodular pattern, left hydronephrosis and diffuse bladder wall thickening. Disseminated tuberculosis was considered as diagnosis by the coexistence of this imagiologic alterations and sterile pyuria. Acid-fast test for Mycobacteriumtuberculosis was negative, but the urine culture became positive after 2 weeks.Antituberculosis treatment was started. One year later, he was asymptomatic and the structural urinary lesions had disappeared.info:eu-repo/semantics/publishedVersio

Is the transition redshift a new cosmological number?

Observations from Supernovae Type Ia (SNe Ia) provided strong evidence for an expanding accelerating Universe at intermediate redshifts. This means that the Universe underwent a transition from deceleration to acceleration phases at a transition redshift $z_t$ of the order unity whose value in principle depends on the cosmology as well as on the assumed gravitational theory. Since cosmological accelerating models endowed with a transition redshift are extremely degenerated, in principle, it is interesting to know whether the value of $z_t$ itself can be observationally used as a new cosmic discriminator. After a brief discussion of the potential dynamic role played by the transition redshift, it is argued that future observations combining SNe Ia, the line-of-sight (or "radial") baryon acoustic oscillations, the differential age of galaxies, as well as the redshift drift of the spectral lines may tightly constrain $z_t$, thereby helping to narrow the parameter space for the most realistic models describing the accelerating Universe.Comment: 12 pages, 5 figures. Some discussions about how to estimate the transition redshift have been added. New data by Planck and H(z) data have been mentioned. New references have been adde

Communities reclaiming power and social justice in the face of climate change

As the climate crisis accelerates and disproportionately affects marginalised communities and countries in the global South, the need for power and social justice approaches is particularly important. Community psychology, with a long interest in the impacts of power discrepancies on the well-being of groups and communities, can offer theoretical and practical tools for addressing climate change and environmental problems without reproducing or intensifying existing inequalities and injustices. This special issue looks at communities’ struggles for climate and environmental justice by focusing on how they resist, contest and overcome power inequalities. The issue consists of one perspective and six empirical articles. Most contributions come from high climate vulnerable countries and regions in the global South. Authors address current and relevant environmental and climate change issues such as renewable energy and natural resource extraction, social transformations and extreme weather events, the links between poverty, rurality and climate change, youth empowerment, and racism in climate activism. Inspired by their contributions, community psychology approaches and interdisciplinary research on environmental and climate justice, we discuss a research and intervention agenda for a community psychology of climate change.info:eu-repo/semantics/publishedVersio